"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M92T-GHF : accessed 18 Jan 2014), Barbary Cultenburg in household of John Cultenburg, Summit Township, Marion, Iowa, United States; citing sheet , family 111, NARA microfilm publication T623, FHL microfilm 1240447.